JP2001514147A - Lift carriage - Google Patents

Abstract

(57) [Summary] The present invention has a frame member (2), a carrying member (13), and a lifting member (14), and the frame member (2) is provided on the frame member. It has a set of wheels (1) arranged for movement of a carriage on a table, and a carriage member (13) is provided on a frame member (2) and extends upwardly from the frame member. A lifting member (14) extending away from the lifting member, the lifting member (14) being arranged to receive an object to be raised and lowered and mounted movably on the carrying member (13). About. Furthermore, the frame member has two side pieces (3, 4) which are interconnected. The side pieces (3, 4) are interconnected by at least a first beam member (5), on which the carry member (13) is provided and an advantageous implementation As a form, the side pieces (3, 4) are connected to the carry member (13) by the second beam member (6) and are arranged behind the carry member (13).

Description

DETAILED DESCRIPTION OF THE INVENTION

(Technical Field) The present invention has a frame member, a carry member, and a lift member, and the frame member is provided on the frame member and arranged so that the carriage can move on a base. A set of wheels, wherein the carrier member is provided on the frame member and extends upwardly from the frame member in a direction away from the base, and the lifting member is configured to receive the object to be raised and lowered. The frame member is disposed and mounted on the carry member so that it can be displaced, and the frame member is connected to each other.
A lift carriage having two side pieces.

BACKGROUND OF THE INVENTION Such lift carriages are already known. According to the usual concept of construction, the frame member comprises two cross beams, which connect the side pieces and are in a common vertical plane extending transversely to the normal direction of movement of the lifting carriage. Are substantially arranged. At the same time, a conveying member (carrying member) is fixed to the side of these cross beams in front of these cross beams. Usually, the side pieces are
It has wheels at its ends, by means of which the carriage is driven on a floor or other base. However, known lifting carriages have the disadvantage that the length of the frame member in the direction of movement is very long, which tends to reduce the versatility and the possibility of controlling the lifting carriage. When constructing such a lifting carriage, the side beams may extend rearwardly from the carrying member by a predetermined minimum length in order to prevent the lifting carriage from tipping backwards in a sufficiently safe manner. It is important. From this safety point of view, the cross beam behind the carrying member reduces the space available for the worker operating the lift carriage, allowing the worker to walk and lift the lift carriage in front of him. Pressing and pressing must be done simultaneously. This is known as a common working moment with such a lifting carriage. This is due to the fact that the part of the lifting carriage or the handle that the operator grips by operating the lifting carriage must not be too far behind the carrying member. The reason that the lifting carriage part or handle must not be too far behind the carrying member is that such an arrangement would also lead to a risk of instability and tipping.

DISCLOSURE OF THE INVENTION An object of the present invention is to provide a lift carriage that is flexible, can be operated safely, and has a compact structure.

An object of the present invention is to provide a lift carriage according to the above (technical field), wherein the side pieces are interconnected by at least a first beam member, and the carry member is provided on the first beam member. This is achieved by a lift carriage.
Thus, by mounting or placing the carry member on the connecting beam member, an essential part of the beam member extends rearward or forward from the carry member, and the available area behind and in front of the beam member, respectively. Can be avoided. As a result, a compact structure of the lift carriage is enabled.

[0005] According to one embodiment of the invention, the side pieces are also interconnected by a second beam member, the second beam member being connected to the carry member and of the lift carriage. It is arranged near the carry member in the longitudinal direction. Thereby, the second beam member is advantageously arranged at a distance from the first beam member when viewed in a direction perpendicular to the normal direction of movement of the lifting carriage. In this way, the second beam member is located far above the first beam member and the base, and the second beam member obstructs the foot entry space for the operator operating the lift carriage. Can not be. Advantageously, the second beam member is displaced rearward relative to the first beam member, as viewed in the normal direction of movement of the lifting carriage.

According to another embodiment of the present invention, the side pieces and the two beam members are
A range is defined in the direction and arranged to form a space shaped to accommodate the lifting member.

[0007] According to another embodiment of the present invention, the displacement of the lifting member is provided by a drive motor located below the first beam member. In this way, no more space is required for the location of the drive motor. The space that is no longer needed can, in a better manner, be used by the lifting element or by the operator operating the lifting carriage. Further, the screw member is arranged to be rotated by the drive motor, and is connected to the lift member via a nut member so as to convert rotation of the screw member into translational movement of the lift member. Advantageously, the screw member extends through the first beam member.

According to another embodiment of the present invention, the carrier member is formed as an elongated rod-shaped element. Thereby, the screw member can advantageously extend within the rod-shaped element. Such an elongated element can be made of extruded aluminum. Extruded aluminum ensures a light and strong construction of the carrier member.

According to another embodiment of the invention, the side pieces at least partially extend in the normal direction of movement of the lifting carriage, and furthermore they are essentially parallel to each other. Can be extended.

[0010] According to another embodiment of the invention, at least one of the first and second beam members.
One is manufactured by extruded aluminum.

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in more detail by way of examples and with reference to the accompanying drawings.

1 to 5 show a lift carriage according to the present invention. The lift carriage is provided with four wheels 1 to facilitate movement of the lift carriage on a floor or other base. The wheels 1 are arranged in fork-shaped wheel suspension members, and at least one pair of a front pair and a rear pair of the wheel suspension members is
It can rotate around a vertical axis on the frame member 2 (see FIG. 4). The frame member 2 has two side pieces 3 and 4 which extend essentially parallel to one another and, when viewed from above, point in the normal direction N of movement of the lifting carriage. I have.
It should be noted that, within the scope of the invention, the side pieces 3, 4 can be diverged somewhat in the direction of movement N (the side pieces 3, 4 can be mutually inclined to open with respect to the direction of movement N). is there. Each side piece 3, 4 can be made of simple sheet metal or a more complex cross-section profile associated with a lifting carriage for heavy loads (
Profile), for example, may have a substantially rectangular profile beam structure. Such complex cross-section beam structures can be formed by extrusion profiles of aluminum. Side pieces 3, 4 are first, lower beam 5,
Interconnected by a second, upper beam 6. As a result, the second beam 6 is located above the first beam 5 at a distance from the first beam 5. Beams 5 and 6 desirably have an extruded profile of aluminum (see FIG. 5), which ensures a high strength of the beams 5, 6 while at the same time reducing the weight of the lifting carriage to an appropriate level. Can be kept.

Each side piece 3, 4 has a first, lower part 7 and 8 and a second part 9 and 10, respectively. The first parts 7 and 8 extend mainly in the direction of movement N of the lifting carriage and extend essentially parallel to the base. The second parts 9 and 10 extend obliquely upward from the lower parts 7, 8 respectively and are inclined with respect to the direction of movement N. Thereby, the first, lower beam 5 is screwed through the respective inclined portions 9 and 10 and into the end sides of the lower beam 5,
It is connected to the lower ends of the inclined parts 9 and 10. The second, upper beam 6 is connected to the upper ends of the ramps 9 and 10 by screws extending through the respective ramps 9 and 10 and into the end sides of the upper beam 6. As a result, the inclination of these parts 9 and 10 causes the lower beam 5 to be located in front of the upper beam 6 in the direction of movement N when viewed from above along a vertical line. Furthermore, each side 3, 4 is connected to rearwardly extending parts 11, 12, each of which is provided for supporting one of the rear wheels at a respective end. These parts 11,
12 extend essentially parallel to one another in the direction of movement N of the lifting carriage. It means that these parts 11, 12 can constitute an integral part of the side pieces 3, 4 or can be attached to either the inclined parts 9, 10 or the longitudinal parts 7, 8. Be careful.

Further, the lift carriage has a carry member 13. The carry member 13 stands on the upper surface of the lower beam 5 and is supported laterally on the side surface of the upper beam 6. As is clear from FIGS. 1 to 3, the carry member 13 is formed as a long rod-shaped element, and is also called a lift post. The carrying member 13 is made of extruded aluminum in the illustrated example.

Further, the lift carriage has a lift member in the form of a lift plate 14. The lifting member 14 is provided for receiving an object to be lifted. It should be noted that the lifting member can also be configured in other aspects, for example as a so-called lift fork. The lift plate 14 is fixed to a support member 15, which is essentially parallel to the lift post 13, a part of which is fixed to a slide 16, which slide 16 extends in the longitudinal direction of the lift post 13. It extends through the gap and can be displaced in the longitudinal direction of the lifting post 13. Thereby, the lift plate 14 can be displaced from the lower end position shown in the drawing to the upper end position of the upper end of the lift post 13. The slide 16 is driven by a rotary screw member 17 provided inside the lift post 13. The rotation of the screw member 17 is controlled by an electric motor 18 located below the lower beam 5.
Given by Power to the motor 18 is ensured by a battery package 19 located on the lift post 13 opposite the lift plate 14. Further, the lift carriage is provided with a handle 20 for easily and comfortably moving the lift carriage on the base. Removable control unit 2
1 is arranged on a handle 20 and its control unit 21 controls the drive motor 1
8 are driven to raise and lower the lift plate 14, respectively. further,
The lift carriage 14 has a brake (not shown), which acts on at least the rear wheel 1 and has legs extending inward in a curved curve from the two rearwardly extending parts 11,12. It can be activated by the member 22.

There is a nut member 23 with a female thread having a thread pitch corresponding to the thread pitch of the screw member 17 for displacing the slide 16 and thereby the lift plate 14 along the lifting post 13. A screw member 17 extending essentially through the full lifting post 13 also extends through the passage of the slide 16.
At the upper end of the lift post 13, the screw member 17 is attached to the roller bearing 2.
4 attached. At the lower end of the lifting post 13, the screw member 17 has a connecting portion 25 extending through the lower beam 5. By means of the connection 25, the screw member 17 can be connected to the output shaft of the worm gear device. The input shaft of the worm gear device is connected to the drive motor 18 (see FIG. 5). A limit switch (not shown) that cuts off current to the drive motor 18 when the slide 16 reaches the upper end position is also positioned at the upper end of the lift post 13.

The nut member 23 is provided at an open portion of the slide 16 and can be connected to the slide 16 via a connecting device. The connecting device includes a first connecting member 26 connected to the slide 16 and a second connecting member 27 connected to the nut member 23. In the illustrated example, the connecting members 26 and 27 each have a set of shaft teeth, and these teeth are arranged so as to mesh with each other. Each tooth comprises a first tooth flank having a surface extending essentially in the axial plane and a second tooth flank having a surface inclined at an angle to the axis of rotation of the screw member 17. I have. Thereby, the inclined surface of the tooth flank of the first connecting member 26 is arranged to interact with the inclined surface of the tooth flank of the second connecting member 27. Thus, the axial surface of the tooth flank of the first connecting member is
It is arranged to interact with the axial surface of the tooth flank of the second connecting member 27. The inclination angle is essentially equal to the inclination angle of the screw pitch between the screw member 17 and the nut member 23. Further, the inclination angles of the connecting members 26 and 27 are opposite to the inclination angles of the screw member 17. Further, a load is applied to the nut member 23 in advance in a direction toward the first connecting member 26 by a spring (not shown).

When the screw member 17 is rotated and the nut member 23 is prevented from rotating by the connecting members 26 and 27, the nut member 23, the slide 16 and the lift plate 14 together with the nut member 23 Post 13
Is displaced along. In this way, the lift plate 14 and the object located thereon can be raised and lowered. When the screw member 17 is rotated in the direction of raising the lift plate 14, the forces occurring between the nut member 23 and the slide 16 will be transmitted essentially through the axial surfaces of the tooth flanks. This ensures a fixed connection between the connecting members 26 and 27 in the ascending direction. However, when the screw member 17 rotates in the opposite, downward direction, the force occurring between the nut member 23 and the slide 16 will be transmitted through the inclined surface of the tooth flank. During normal conditions in which a large force does not impede the downward displacement of the lift plate 14, the friction existing between the inclined surfaces of the tooth flanks and the pre-loaded force via the springs is sufficient for the lift plate 14 Guarantee a descent. However, if the lift plate 14 runs across some obstacle during its lowering movement,
The inclined surface of the tooth flank of the first connecting member 26 compresses the spring so that the second
Of the connecting member 27 of the above-mentioned connecting member 27. The continuous sliding movement gradually causes the coupling members 26 and 27 to disengage from each other, the displacing force no longer acts on the slide and the lift plate remains stopped at the reached position. Become.

The present invention can be changed and modified within the scope of the claims without being limited to the embodiments described above.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of a lift device according to an embodiment of the present invention from a side.

FIG. 2 is a front view of the lift device of FIG. 1;

FIG. 3 is a view seen from behind the lifting device of FIG. 1;

4 is a top view of the lift device of FIG. 1;

FIG. 5 is a sectional view taken along line VV in FIG.

[Procedural Amendment] Submission of translation of Article 34 Amendment of the Patent Cooperation Treaty

[Submission Date] March 1, 2000 (200.3.1)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

Claims (14)

[Claims] 1. A frame member (2), a carry member (13) and a lift member (
14), wherein the frame member (2) has a set of wheels (1) provided on the frame member (2) and arranged so that the carriage can move on a base. The carry member (13) is provided on the frame member (2) and includes the frame member (2).
Extends upward from the base in a direction away from the base, and the lift member (14)
Said carry member (13) arranged to receive an object to be raised and lowered
The frame member (2) is mounted so as to be displaceable.
) Is a lifting carriage having two interconnected side pieces (3, 4), wherein said side pieces (3, 4) are interconnected by at least a first beam member (5). A lift carriage, wherein the carry member (13) is provided on the first beam member (5). 2. The side pieces (3, 4) are also connected to each other by a second beam member (6), and the second beam member (6) is connected to the carry member (13). And the carry member (13) in the longitudinal direction of the lift carriage.
2. The lift carriage according to claim 1, wherein the lift carriage is disposed near to the first carriage. 3. The second beam member (6) is arranged at a distance from the first beam member (5) when viewed in a direction perpendicular to the normal direction of movement (N) of the lifting carriage. The lift carriage according to claim 2, which is provided. 4. The second beam member (6) is displaced rearward with respect to the first beam member (5) in the normal direction of movement (N) of the lifting carriage. 4. The lift carriage according to any one of 2 and 3. 5. The side pieces (3, 4) and the beam members (5, 6) such that they are delimited in three directions and can accommodate the lifting member (14). The lift carriage according to any one of claims 1 to 4, wherein the carriage is arranged to form a space formed in the lift. 6. The first beam member (5), wherein the displacement of the lift member (14) is changed.
The motor is provided by a drive motor (18) arranged under the motor.
The lift carriage according to any one of the preceding claims. 7. A screw member (17) is arranged to be rotated by a drive motor (18), and converts rotation of the screw member (17) into translational movement of the lift member (14). A lift carriage according to claim 6, wherein the lift carriage is connected to the lift member (14) via a nut member (23). 8. The screw member (17) is connected to the lower first beam member (5).
8. The lift carriage according to claim 7, wherein the lift carriage extends through a). 9. The lift carriage according to claim 1, wherein the carry member is formed as an elongated rod-shaped element. 10. Lift carriage according to claim 7, wherein a screw member (17) extends in the rod-shaped element (13). 11. Lift carriage according to claim 9, wherein the rod-shaped element is made of extruded aluminum. 12. The lift carriage according to claim 1, wherein the side pieces extend at least partially in the normal direction of movement of the lift carriage. . 13. Lift carriage according to claim 1, wherein the side pieces (3, 4) extend essentially parallel to one another. 14. The lift carriage according to claim 1, wherein at least one of the first and second beam members (5, 6) is made of extruded aluminum.